Wristwatch buckle



FIG. 1 is a perspective view of a wristwatch buckle in the open condition showing my new design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a side elevational view of one side thereof. 

The ornamental design for a wristwatch buckle, as shown and described. 